A researcher at a major clinic wishes to estimate the proportion of the adult population of the United States that has sleep deprivation. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 4%?  (423 is an incorrect answer)

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 87%. You would like to be 98% confident that your estimate is within 1% of the true population proportion. How large of a sample size is required?

A group of students need to submit a project and they need to survey people about their daily routine. How many people should they survey in order to be 95% confident that the estimated ( sample) proportion is within three percentage points of the true population? Assume that pq= 0.25

A researcher wants to do a study to see what the proportion of vaccinated people is in a certain area of New Jersey. How many people need to be polled to be with 2% of the actual population proportion with 95% confidence?

Use the expression in the accompanying discussion of sample size to find the size of each sample if you want to estimate the difference between proportions of men and women who own smartphones. Assume that you want 95​% confidence that your error is no more than 0.045.   The sample should include how may men?  and how manywomen?

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 40%. You would like to be 99% confident that your estimate is within 1.5% of the true population proportion. How large of a sample size is required?

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 34%. You would like to be 98% confident that your estimate is within 2.5% of the true population proportion. How large of a sample size is required?n =

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 72%. You would like to be 99% confident that your estimate is within 4.5% of the true population proportion. How large of a sample size is required?n =

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 38%. You would like to be 95% confident that your estimate is within 1.5% of the true population proportion. How large of a sample size is required? Hint: Textbook Video

What percent of our campus is female? The Statistical Abstract of the United States, 112th edition, indicates that approximately 54% of college students are female. Now, how large a sample do we now need to be 99% sure that the error will be no more than 0.03 from? 1838 students 1849 Students 1834 Students 1853 Students